Answer this question truthfully
### Question: What causes Hypersomnia?
### Response: The usual approach is to consider other potential causes of excessive daytime sleepiness.
Other sleep disorders that may cause daytime sleepiness include:
Isolated sleep paralysis Narcolepsy Obstructive sleep apnea Restless leg syndrome
Other causes of excessive sleepiness include:
Atypical depression Certain medications Drug and alcohol use Low thyroid function (hypothyroidism) Previous head injury